How hard is the water in Silverdale, WA?

Tap water hardness
80mg/L
4.7gpg
Moderately hard

Reported by North Perry Ave Water District · July 2025

WA typical
36 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Silverdale has about 80 mg/L of hardness, which is 4.7 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from North Perry Ave Water District, dated July 2025.

Silverdale on the hardness scale, with nearby cities
060120180240300360+WA typical 36Lake Forest Park: 30 mg/LLake Forest Park 30Seattle: 31 mg/LSeattle 31Shoreline: 31 mg/LShoreline 31White Center: 31 mg/LWhite Center 31Edmonds: 35 mg/LEdmonds 35Bremerton: 39 mg/LBremerton 39Port Orchard: 39 mg/LPort Orchard 39Tracyton: 49 mg/LTracyton 49Poulsbo: 67 mg/LPoulsbo 67Bainbridge Island: 70 mg/LBainbridge Island 70Silverdale 80mg/L as calcium carbonate060120180240300360+WA 36Seattle: 31 mg/LSeattle 31Bremerton: 39 mg/LBremerton 39Port Orchard: 39 mg/LPort Orcha. 39Tracyton: 49 mg/LTracyton 49Poulsbo: 67 mg/LPoulsbo 67Bainbridge Island: 70 mg/LBainbridge. 7080 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Silverdale sits 44 mg/L above the typical Washington figure of 36. None of the 10 nearest cities we track has harder water. The range nearby runs from 30 mg/L in Lake Forest Park to 70 in Bainbridge Island.

What 80 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Silverdale

3 people × 75 gallons a day × 4.7 gpg = 1,051 grains a day. A 24,000-grain unit regenerates about every 22 days.

Size it for your household

EPA record for Silverdale's water system

North Perry Ave Water District · PWSID WA5360950

No health-based violations since 2016

Serves about 24,402 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Silverdale to this system. EPA's service-area records do not name Silverdale, so check the utility printed on your water bill.

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Silverdale water hard?

Somewhat. It measures about 80 mg/L (4.7 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Silverdale in grains per gallon?

About 4.7 gpg. One grain per gallon equals 17.1 mg/L, so 80 mg/L divided by 17.1 gives 4.7.

What size water softener do I need in Silverdale?

For 3 people using 75 gallons each per day, 4.7 gpg works out to about 1,051 grains a day. A 24,000-grain softener covers that with a regeneration about every 22 days.

Has the Silverdale water system had EPA violations?

EPA records show no health-based violations for North Perry Ave Water District since 2016.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, July 8, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.